From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B72C3C433F5 for ; Mon, 16 May 2022 14:11:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244449AbiEPOLi (ORCPT ); Mon, 16 May 2022 10:11:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244479AbiEPOLL (ORCPT ); Mon, 16 May 2022 10:11:11 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3778F2AF7; Mon, 16 May 2022 07:11:10 -0700 (PDT) Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id 8469521F6D; Mon, 16 May 2022 14:11:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1652710268; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=dmHPB9vjv1LBmNrF4zaonBMXasUoClA4XRHwK4fdG3Q=; b=uHHoYScC3vOzAq1rF/GezErIJTTCAnG26YueVBaMYGI4KIiBuE4CJEi5I5FkSHuHNJvOhi jBbeahpPdNTqQb9qWzy8wQwtiwj/B2njZ1Svs0P1iMsaZXkpVlpc6Bgj/6IAHlnD6RNRY+ 7obFqakfVm+qw0H2R1BXYJwwfwabCHA= Received: from suse.cz (unknown [10.100.201.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay2.suse.de (Postfix) with ESMTPS id C9CB72C141; Mon, 16 May 2022 14:11:06 +0000 (UTC) Date: Mon, 16 May 2022 16:11:06 +0200 From: Petr Mladek To: "Guilherme G. Piccoli" Cc: akpm@linux-foundation.org, bhe@redhat.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, coresight@lists.linaro.org, linuxppc-dev@lists.ozlabs.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-leds@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-pm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-tegra@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, netdev@vger.kernel.org, openipmi-developer@lists.sourceforge.net, rcu@vger.kernel.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org, kernel-dev@igalia.com, kernel@gpiccoli.net, halves@canonical.com, fabiomirmar@gmail.com, alejandro.j.jimenez@oracle.com, andriy.shevchenko@linux.intel.com, arnd@arndb.de, bp@alien8.de, corbet@lwn.net, d.hatayama@jp.fujitsu.com, dave.hansen@linux.intel.com, dyoung@redhat.com, feng.tang@intel.com, gregkh@linuxfoundation.org, mikelley@microsoft.com, hidehiro.kawai.ez@hitachi.com, jgross@suse.com, john.ogness@linutronix.de, keescook@chromium.org, luto@kernel.org, mhiramat@kernel.org, mingo@redhat.com, paulmck@kernel.org, peterz@infradead.org, rostedt@goodmis.org, senozhatsky@chromium.org, stern@rowland.harvard.edu, tglx@linutronix.de, vgoyal@redhat.com, vkuznets@redhat.com, will@kernel.org, Benjamin Herrenschmidt , Catalin Marinas , Florian Fainelli , Frederic Weisbecker , "H. Peter Anvin" , Hari Bathini , Joel Fernandes , Jonathan Hunter , Josh Triplett , Lai Jiangshan , Leo Yan , Mathieu Desnoyers , Mathieu Poirier , Michael Ellerman , Mike Leach , Mikko Perttunen , Neeraj Upadhyay , Nicholas Piggin , Paul Mackerras , Suzuki K Poulose , Thierry Reding , Thomas Bogendoerfer Subject: Re: [PATCH 20/30] panic: Add the panic informational notifier list Message-ID: References: <20220427224924.592546-1-gpiccoli@igalia.com> <20220427224924.592546-21-gpiccoli@igalia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220427224924.592546-21-gpiccoli@igalia.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 2022-04-27 19:49:14, Guilherme G. Piccoli wrote: > The goal of this new panic notifier is to allow its users to > register callbacks to run earlier in the panic path than they > currently do. This aims at informational mechanisms, like dumping > kernel offsets and showing device error data (in case it's simple > registers reading, for example) as well as mechanisms to disable > log flooding (like hung_task detector / RCU warnings) and the > tracing dump_on_oops (when enabled). > > Any (non-invasive) information that should be provided before > kmsg_dump() as well as log flooding preventing code should fit > here, as long it offers relatively low risk for kdump. > > For now, the patch is almost a no-op, although it changes a bit > the ordering in which some panic notifiers are executed - specially > affected by this are the notifiers responsible for disabling the > hung_task detector / RCU warnings, which now run first. In a > subsequent patch, the panic path will be refactored, then the > panic informational notifiers will effectively run earlier, > before ksmg_dump() (and usually before kdump as well). > > We also defer documenting it all properly in the subsequent > refactor patch. Finally, while at it, we removed some useless > header inclusions too. > > Signed-off-by: Guilherme G. Piccoli All notifiers moved in this patch seems to fit well the "info" notifier list. The patch looks good from this POV. I still have to review the rest of the patches to see if it is complete. Best Regards, Petr